Strings in Python can be used to store a contiguous set of characters. To define a string, you simple type the characters within single or double quotes. For example, newString = ‘Hello world!’ will store that string of characters (Hello world!) in the variable called newString:

>>> newString = 'Hello world!'
>>> print (newString)
Hello world!

You will get the same result if you use the double quotes to define a string:

>>> newString = "Hello world!"
>>> print (newString)
Hello world!

The reason why both forms are used is so you can embed a quote character of the other type inside a string. For example, you may embed a single-quote character in a string enclosed in double-quote characters:

>>> newString = "Mark's car"
>>> print (newString)
Mark's car

Note that you can not perform numeric operations with string variables, even if the string stored in the variable consists only of numbers. Consider the following example:

>>> x = '5'
>>> y = '3'
>>> print (x + y)

The + operator concatenates two strings. To perform an arithmetic operation, we need to conver the string variables to integer or floating-point variables:

>>> x = int ('5')
>>> y = int ('3')
>>> print (x + y)
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